Method for irradiation modification of polyolefin and application of irradiation modified polyolefin

The invention provides a method for modifying polyolefin by irradiation, which comprises the following steps: S1, irradiating polyolefin powder at room temperature for 12-48 hours under the irradiation dose of 20-60 kGy to obtain pre-modified polyolefin; s2, mixing the pre-modified polyolefin with carbon tetrachloride, irradiating the mixture in an oxygen-free environment for 8-24 hours, filtering the mixture, and drying a filter cake at 45-60 DEG C to obtain modified polyolefin powder; the invention also provides an application of the irradiation modified polyolefin prepared according to the method as a wire and cable material. The wire and cable material is prepared from the following raw materials in parts by weight: 120-200 parts of irradiation modified polypropylene, 30-70 parts of irradiation modified polyethylene, 40-80 parts of calcium carbonate, 10-35 parts of a compatilizer, 1-5 parts of a coupling agent and 2-7 parts of an antioxidant, the wire and cable material prepared by the invention has good